Nov 1, 1976

Clinical pharmacologic observations on atenolol, a beta-adrenoceptor blocker

Clinical Pharmacology and Therapeutics
H C BrownR G Shanks

Abstract

The effects of oral and intravenous administration of atenolol were studied in healthy volunteers. The oral administration of a series of single doses of atenolol reduced an exercise tachycardia. After a 200-mg dose, the effect on an exercise tachycardia was maximal at 3 hr and declined linearly with time at a rate of approximately 10% per 24 hr. The peak plasma atenolol concentration occurred at 3 hr and thereafter declined exponentially with time with an elimination half-life of 6.36 +/- 0.55 hr: 43 +/- 3.9% of the dose was excreted in the urine within 72 hr. There was a correlation between the reduction in an exercise tachycardia and the logarithm of the corresponding plasma concentration. The intravenous administration of atenolol reduced exercise tachycardia with a significant correlation between effect and plasma concentration. After 50 mg intravenously, 100% of the dose was recovered from the urine, and the clearance was 97.3 ml/min. Comparison of AUC O leads to chi after oral and intravenous administration of 50 mg showed the bioavailability to be 63% after oral drug. Repeated oral administration of atenolol 200 mg daily either as a single dose or in divided 12 hourly doses for 8 days maintained reduction of an exercise...Continue Reading

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Mentioned in this Paper

Urine
Depression, Chemical
Intravenous Injections
Propanolamines
Plasma
Biological Availability
Atenolol
Healthy Volunteers
Oral Cavity
Half-Life

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